This is a very useful bibliographical tool produced by the efforts of the International Association of Labour History Institutions (IALHI). This association comprises more than one hundred archives, libraries and research centers all over the world, though the vast majority are located in Europe, and not all of them have the same importance, reflecting the geographical and political unevenness of socialism's history. This particular volume aims to list all the publications of the social-democratic internationals after 1914, i.e. from the time of the political split due to the support for World War I by most social-democratic parties. This means that the left-wing, beginning with the Kienthal-Zimmerwald movement during the war and leading to the “Communist International” from 1919 on, is not represented here. But also left-wing splits from social democracy in later years, as in the 1930s with the “London Bureau” of left-wing socialist parties (and also the Bureau's predecessors) are excluded here, as they openly campaigned against social democracy. Also, a few international workers' institutions (mainly in the cultural field) that had been founded before 1914, but tried to maintain their independence after 1914 faced with the political split, are therefore not listed as well.